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03-22-2010, 10:25 PM | #1 (permalink) |
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Join Date: Feb 2010
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gy520 trex500
I recently decided to move on from my blade 400 and bought a trex 500 the guy at my LHS suggested i run hs5245mg's all around as he does and has no problems with some mild 3d on his and instead of the gy401 he upsold me on the gy520.... my heli is together with it first flight any time but i cant seem to get the gyro right.....
here are my questions: - is the hs5245mg ok too use ? - 7.5 ml from center of the servo horn screw out? - what is AVCS and is that all i should fly in ? - in my dx6i regular gyro gain should be %70 and idle up %40 ? - if so why does it not hold and act twitchy/jumpy when i try and hover? I have read the book i swear 30 times but being a newbie it doesn't all make sence just yet , i set it up as digital 1520us normal compensation set the limits f3c mode standard response i really want this too work as i am dying to fly this bad boy
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
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03-23-2010, 07:39 PM | #2 (permalink) |
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seriously no one can help?
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-23-2010, 07:41 PM | #3 (permalink) |
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another decent afternoon sitting
some one even comment on one question ?
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-23-2010, 07:47 PM | #4 (permalink) |
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with the gy520 u want to use the futaba 9257 on the tail.. The gy520 ive learned if very picky when it comes to using any other tail servo other then futaba but get the 9257 and you tail will be rock solid man
and basicly use all the default settings on the gyro only thing u need to mess with is the reversing if you have it mount upside down and also the 3rd setting your servo limits for the tail slider and thats all u want to mess with |
03-23-2010, 08:32 PM | #5 (permalink) |
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Join Date: Oct 2008
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burton8012, did you set your tail blade pitch at 0 or did you set it up to not drift in a rate mode hover? I have this gyro coming in the mail I already have a 9257 on the tail.
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03-23-2010, 09:08 PM | #6 (permalink) | |
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Quote:
check out my site i just started my own heli forum bout a week ago and get any questions u have on there http://www.heliaddictsrc.com/ |
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03-23-2010, 10:35 PM | #7 (permalink) |
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i went through and adjusted the limits and set the center to 0 deg as per the instructions , it must be the servo god dam LHS i will grab one in the next day and keep the hitec for a spare i guess..... you never know
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-23-2010, 10:46 PM | #8 (permalink) |
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Set your tail up so everything is 90 deg, servo horn bellcrank etc. The make sure you MECH. TRIM your tail in RATE mode. I know Futaba states not to do this but it absolutley must be done for the gyro to perform well. I went through some growing pains with the 520 as soon as it was avaliable and know from experience. You may also want to consoider a full size rudder servo. I am running a BLS-251 on my 500 ESP an the tail is rock solid. I am running a 3-G FBL system now but the tail was great with the GY52/BLS-251 combo.
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03-23-2010, 10:57 PM | #9 (permalink) |
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i wouldn't worry about doing anything in rate mode this gyro is so easy to setup and proforms great the first try when u set it up the way i listed above but thats only with the 9257 might have to setup in rate mode if your having problems with other servos holding the tail but the gy520 and 9257 are a perfect match for each other have to be careful not all servos work with the gy520 so that may be why it caused you some problems
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03-23-2010, 11:13 PM | #10 (permalink) |
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Taken from Bobby Watts Website
" 3) POSSIBLY THE MOST IMPORTANT TIP FOR THIS GYRO!!!!! Tracking your tail in non- heading hold mode: In order to get the most performance out of the GY520, you MUST track your tail in non- heading hold, meaning that in an idle up head speed, with a decent amount of gain in NON HEADING HOLD MODE, your tail must not rotate. If the tail begins to slowly pirouette in a hover, adjust the tail rotor pushrod linkage to achieve a neutral point. Once this has been done, flip back into Heading Hold mode and go fly!! This made a night and day difference in the performance of my gyro. " I found out early on this gyro needs to be trimmed in rate mode to perform well. I was having a tail issue with my Furion 450 and was trying everything I could. |
03-23-2010, 11:36 PM | #11 (permalink) |
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Sorry, I just saw this thread right now.
I am not familiar with the hs5245mg, so I cannot comment on that. As far as servo arm length goes, the GY520 will tell you if the arm is too long (but not if it is too short). I have GY520's presently in service with Futaba 9650's and 9254's. Also with JR 3400G's, 3500G's, and 8900G's (10 in all). The gyro performance is superb with all of these servos. It is very important to set it up in Rate mode, to get the best performance out of it (besides, who are we to argue with Bobby Watts?). I have done it both ways and it works far better if set up in Rate mode. From another thread on this forum: This is what I did: (post #167) https://www.helifreak.com/showthread....124295&page=17 Follow the instructions in the manual, with the exception of setting it up in Rate mode (which thy say not to do in the instructions, but Futaba now recommends). In the TX: Start with 30% expo on your rudder channel in the TX Make sure there is no trim or sub trim in any flight mode on your rudder channel. On the gyro: Set the servo type, Then the direction, Then the limits, Leave the flight mode in F3C Leave the response as Standard Trim it mechanically in Rate Mode (no drift at all). Land it and reset the limits (they may have changed when you trimmed mechanically). Re-initialize it in HH mode and test fly. Back to the Tx: Increase or decrease the gain to where the tail holds properly (I usually overdo it, get a bit of a wag, then back the gain down until it just doesn't wag. Some people sneak up on it from the other direction). If the rudder response is too slow around center, decrease the Expo on the rudder channel. If the tail wags when you stop hard (or you can see it move or wag a bit as you change throttle) increase the Expo on the rudder channel. If the rudder response/pirouette rate is too slow at the extremes of throw, increase the endpoints (you can differentially adjust the endpoints to get the pirouette rate equal in both directions). By the way, I have now installed and test hovered the tenth GY520 and it works just as good as the rest. I have not flown it around and fine tuned it yet! __________________
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03-23-2010, 11:54 PM | #12 (permalink) |
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i adjusted the rate starting at 70% and going down to 50% and not much of a change in jumping so im thinking the gyro might not like the hs5245mg , i will replace tomorrow and re set the gyro and report back , im itching to fly so bad
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-24-2010, 08:11 AM | #13 (permalink) |
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i agree somewhat with setting up in rate mode but i would do that last.... if the first way of setting up doesn't work for you well
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03-24-2010, 08:38 PM | #14 (permalink) |
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tryed to set the tail at the park , seems like no matter what i do it wags so im changing the servo before i try again , 6 min of tail wagging hover felt better than nothing , man the 500 is so stable
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-24-2010, 10:29 PM | #15 (permalink) |
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yeah man its the servo your using on the tail its very picky with what sevos work with it... when i used a analog servo and even some othe brand digital the tail would twitch and and if i held the heli in my hand and watch what the servo did when i went full left and right rudder i see it twitch...see if yours acts funny when you go full left and right just make sure your throttle hold is on
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03-24-2010, 11:03 PM | #16 (permalink) | |
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Quote:
Do you understand what we are saying by setting it up in rate mode? YOu want to lower your gain below 50% (red light on gyro will turn blue) and hover the heli, be ready to hold in a rudder input to keep it straight. Take not of what rudder deflection you need to hold then land and mechanically adjust your tail until it ill hold a hover with no drift. Also where is your gyro mounted? I had mine on the stock RX tray, I suspected this area was to flimsy when I was building and my initial flights comfirmed it. I hada slight twitch during flight but after changing the RX plate for a KDE alloy upgrade no twitch. I am not familiar with Hitec servos so I can not comment on if that servo is suitable for tail use. |
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03-27-2010, 10:21 PM | #17 (permalink) |
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no i didn't understand that , so lower the gain till the light changes and mechanically adjust the tail then raise the gain and lower till wag stops ? i will try that , i was fliching my gyro switch to change the light then trying to set it then flicking the switch back
Gyro is mounted on top of the rear tail boom block , its shaft drive tail so that should work great
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-29-2010, 01:44 PM | #18 (permalink) |
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how low should i go? or just untill the light turns blue at 51%? does flicking the gyro switch put it in hh mode? or just leave it and lower the gain?
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TREX 550FBL beastX ,align ds servos ,CCv2 ice 75 , CC bec Turnigy nano tec 5000 mah 6s 65c , blade450 3d and couple more toys to play with |
03-30-2010, 03:10 AM | #19 (permalink) |
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Just got my 520 in the mail yesterday and so far it works excellent! Before i got this gyro I was living with a gy401 drift but the tail is now locked with the 520. I only flew out 1 pack so far and need to fly one more pack to fine tune my gain but so far I am very happy with it!
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03-30-2010, 03:14 AM | #20 (permalink) |
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I just noticed this threas, the HS-5245MG is not going to be fast enough as a tail servo on the 500
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